Central here is the command "b = f.filter(a)" where we feed one sample at a time into the filter
and receive the filtered sample instantly. This command can directly be used during
comedi's asynchronous acquisition, for example to remove 50Hz in realtime.
comedirecord uses this library to remove the
50Hz while plotting it.

Download

USB-DUX's UBUNTU respository. Just type:

sudo add-apt-repository ppa:berndporr/usbdux

The packages iir1 and iir1-dev will then show up in your package manager.